/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2009 Robert Osfield 
 *
 * This library is open source and may be redistributed and/or modified under  
 * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or 
 * (at your option) any later version.  The full license is in LICENSE file
 * included with this distribution, and on the openscenegraph.org website.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 
 * OpenSceneGraph Public License for more details.
*/

#ifndef OSGVOLUME_FIXEDFUNCTIONTECHNIQUE
#define OSGVOLUME_FIXEDFUNCTIONTECHNIQUE 1

#include <osgVolume/VolumeTechnique>

namespace osgVolume {

class OSGVOLUME_EXPORT FixedFunctionTechnique : public VolumeTechnique
{
    public:

        FixedFunctionTechnique();

        /** Copy constructor using CopyOp to manage deep vs shallow copy.*/
        FixedFunctionTechnique(const FixedFunctionTechnique&,const osg::CopyOp& copyop=osg::CopyOp::SHALLOW_COPY);
        
        META_Object(osgVolume, FixedFunctionTechnique);

        virtual void init();

        virtual void update(osgUtil::UpdateVisitor* nv);

        virtual void cull(osgUtil::CullVisitor* nv);
        
        void setNumSlices(unsigned int numSlices);

        unsigned int getNumSlices() const { return _numSlices; }
        

        /** Clean scene graph from any terrain technique specific nodes.*/
        virtual void cleanSceneGraph();

        /** Traverse the terrain subgraph.*/
        virtual void traverse(osg::NodeVisitor& nv);

    protected:
    
        virtual ~FixedFunctionTechnique();
        
        osg::ref_ptr<osg::Node> _node;
        
        unsigned int _numSlices;
};

}

#endif
